73 



under a cover oi" basal^, and associated with the tin deposits ; CaSQ 66, 

 it contains imprin'-S o£ the leaves of plants not now living in 

 Australia. 



1726 and other specimens from Mole Tableland have a 

 ferruginous cement. 1722, from Emmaville, has been trans- 

 formed into a hard, tenacious rock by the cementing action of 

 silica ; it is locally known as " grey-billy." 



In a special case, standing in the central passage near here, is- 

 a large mass of tin cement from New England. 



In case 126 Avill be found a very rich specimen of the Elsmore 

 cement. 



Nest in order to the cements are a number of nuggets of tin- 

 stone found in the Emmaville leads, some of which are of great 

 size. Other nuggets, including one from the Elsmore Lead, will 

 be found in case 126. 



9088, Elsmore : a portion of a crystal, the edges of which have 

 been rounded. It is easy to understand how^ continued rolling 

 in the bed of a stream would produce this effect. 



Tin-pyrites : sulphide of tin, copper, and iron. A.n uncommon gtaanite 

 mineral, needing considerable experience for its sure detection. 



9195, Bora Creek (Howell), Inverell : galena, blende, stannite, 

 with quartz — the stannite, in contrast with the other minerals, 

 being recognised by its somewhat greenish tint. The ore is* 

 argentiferous. 



9553, Bora Creek : almost pure stannite. 



IRON (ORES). 



This case is reserved entirely for average samples of the known Case 67- 

 deposits of iron ores in New South Wales. These deposits are 

 fully described in the piiblications of the Geological Survey. 

 Each sample is accompanied by a label giving an analysis of the 

 ore and a concise description of the deposit. Bauxite and 

 bausitic iron ore are include d here. 



